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Short range metal detector [Project]
posted March 20 2014 4:28.38 by spic0m

The heart of this diy metal detector circuit is the CS209A IC. The metal detector is built with one 100┬ÁH coil that has 40 mm in diameter and is made of 50 turns/0.4 mm wire. CS209A has one oscillator wich forms a LC circuit, the inductance of the coil will change when it is near metal objects.

LED 1 will light up and the buzzer turns ON when the coil is changing inductance. The setup is easy, VR1 is adjusted (away from any metal objects) so that LED 1 will light and the buzzer sounds on, and then VR1 will be trimmed until led and buzzer are off.

[Link: Electroschematics]

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